All Mugen parts have Mugen Racing Cast into them, so you they are genuine.

The motor was rebuilt a few years and it made approx 80hp at the wheels on the dyno (the car weighs approx 550kg).

The motor has had the following work done to it:
•Match ported and fully flowed EB3 head
•High top pistons
•Fully balanced bottom end
•RS exhaust manifold
•Stainless steel exhaust system
•Mocal oil cooler with remote oil filter
Pretty cool.. wish I had the money laying around